Class / Patent application number | Description | Number of patent applications / Date published |
315247000 | With power factor control device | 37 |
20080218097 | Emulation Circuit - An emulation circuit is disclosed for connection to a low energy lamp energised by an AC supply and substituted for an incandescent lamp in a traffic signal installation. The circuit comprises means for sensing the magnitude of a supply voltage applied to energise the lamp connected to the terminals and means for sensing correct operation of the lamp. When the lamp is sensed to be operating correctly an auxiliary load intermittently to draw an additional current through the auxiliary load from the AC supply. The additional current is drawn only between preset phase angles of the cycles of the AC supply and the magnitude of the additional current drawn by the auxiliary load is varied in dependence upon the sensed magnitude of the supply voltage. | 09-11-2008 |
20080224629 | LIGHTING SYSTEM WITH POWER FACTOR CORRECTION CONTROL DATA DETERMINED FROM A PHASE MODULATED SIGNAL - A light emitting diode (LED) lighting system includes a power factor correction (PFC) controller that determines at least one power factor correction control parameter from phase delays of a phase modulated signal. In at least one embodiment, a peak voltage of the phase modulated signal is a PFC control parameter used bit the PFC controller to control power factor correction and generation of a link voltage by a PFC LED driver circuit. The phase delays are related to a peak voltage of the phase modulated signal. Thus, in at least one embodiment, detecting the phase delay in one or more cycles of the phase modulated signal allows the PFC controller to determine the peak voltage of the phase modulated signal. | 09-18-2008 |
20080246411 | Fluorescent lamp driver power - A kind of fluorescent lamp driver power consists of the multi-switch converting circuit, power transformer, resonant inductor, resonant capacitor, step-up transformer and rectifier. The primary winding (PW) of the power transformer connects with the AC output of multi-switch converting circuit. The resonant inductor and resonant capacitor, after series connection, connect to the secondary winding (SW) of the power transformer through the PW of the step-up transformer. The SW of the power transformer connects with the rectifier. The SW of the step-up transformer connects with the load output. This invention combines the fluorescent lamp driver power and the power supply of the control system, so that the energy transformation occurs only once for the output from the Power Factor Correction (PFC) Circuit to lamp. By using this invention, the system cost is lowered greatly by saving two converters, working efficiency remarkably enhanced and system stability improved as well. | 10-09-2008 |
20080246412 | Fluorescent lamp driver - The present invention discloses a kind of fluorescent lamp driver, which consists of the multi-switch converting circuit, power transformer (T | 10-09-2008 |
20080278092 | HIGH POWER FACTOR LED-BASED LIGHTING APPARATUS AND METHODS - Power control methods and apparatus in which a switching power supply provides power factor correction and an output voltage to a load via control of a single switch, without requiring any feedback information associated with the load. The single switch may be controlled without monitoring either the output voltage across the load or a current drawn by the load, and/or without regulating either the output voltage across the load or the current drawn by the load. The RMS value of an A.C. input voltage to the switching power supply may be varied via a conventional A.C. dimmer (e.g., using either a voltage amplitude or duty cycle control technique) to in turn control the output voltage. The switching power supply may comprise a flyback converter configuration, a buck converter configuration, or a boost converter configuration, and the load may comprise an LED-based light source. | 11-13-2008 |
20080315783 | ILLUMINATION LIGHT EMITTING ELEMENT AND ILLUMINATION DEVICE PROVIDED THEREWITH - An illumination light emitting element driving circuit includes a power factor improving circuit ( | 12-25-2008 |
20090015173 | Electronic ballasts without toroidal-magnetic-core and fluorescent lamps employ the same - A toroid-free ballast comprising a filter and rectifier circuit ( | 01-15-2009 |
20090146575 | Light Emitting Diode (LED) Driving Device - A light emitting diode (LED) driving device includes a power factor correction (PFC) circuit, a bridge switch circuit, a resonant circuit, a transformer and a feedback circuit. The PFC circuit adjusts an output signal thereof based on a feedback signal. The bridge switch circuit transforms the output signal of the PFC circuit into a pulse signal. The resonant circuit resonates and outputs a sinusoidal signal to a primary-side of the transformer based on the pulse signal. The feedback circuit outputs the feedback signal to the PFC circuit in response to a primary-side current of the transformer. Therefore, an output current of the LED driving device is adjusted through modulating the feedback circuit. | 06-11-2009 |
20090273297 | POWER FACTOR CORRECTION AND DRIVER CIRCUITS - Power factor correction and driver circuits and stages are described. More particularly, power factor correction circuits are described that utilize an auxiliary inductor winding for power regulation. Driver circuits configured for electrical loads such as series arrangements of light emitting diodes are also described. An exemplary embodiment of a driver circuit can implement a comparator and/or a voltage regulator to allow for improved output current uniformity for high-voltage applications and loads, such as series configurations of LEDs. Embodiments of PFC stages and driver stages can be combined for use as a power supply, and may be configured on a common circuit board. Power factor correction and driver circuits can be combined with one or more lighting elements as a lighting apparatus. | 11-05-2009 |
20090289570 | METHOD FOR SUPPLYING A GAS DISCHARGE LAMP, AND A BALLAST CIRCUIT FOR SUCH LAMP - A method and a ballast circuit to supply a gas discharge lamp by a high frequency voltage, which, by using a voltage controlled first generator ( | 11-26-2009 |
20090322238 | Internal Power Supply for a Ballast - A ballast used with an input power source for energizing a lamp. The ballast includes a power stage, a controller, an internal power supply for the power stage and the controller, and an input switch. The power stage energizes the lamp with power supplied by the input power source. The internal power supply is connected to the power stage for receiving power from the power stage and is connected to the input power source via the input switch for receiving power from the input power supply when the input switch operates in a closed mode. When the input switch operates in an open mode it electrically disconnects the internal power supply from the input power source. The controller selectively operates the input switch in the open mode and the closed mode as a function of the voltage of the internal power supply while the lamp is energized. | 12-31-2009 |
20100079078 | Using Pulse Density Modulation for Controlling Dimmable Electronic Lighting Ballasts - Pulse Density Modulation (PDM) controls light brightness from a fluorescent lamp by applying voltages to the lamp filaments at two or more sequential signal frequencies. A low frequency, an intermediate frequency and a high frequency may be used to control the brightness of the lamp. The lamp gas ionizes to produce light only when the low or intermediate frequency voltage is applied thereto. The lamp gas is not ionized at the high frequency voltage, but the high frequency voltage keeps the lamp filaments warm during low brightness conditions. The low frequency, intermediate frequency, no and/or high frequency voltages have time periods that occur within a modulation frame time period that repeats continuously. The ratio of the low frequency and intermediate frequency time periods, and the no and/or high frequency voltage time periods determine the light output of the fluorescent lamp, and also maintain a proper temperature of the filaments. | 04-01-2010 |
20100102742 | Electronic ballast - Provided is an electronic ballast including: a rectifier which rectifies alternating current (AC) power into direct current (DC) power; a power factor compensator which improves a power face of the DC power; an inverter which inverts the DC current into high frequency square wave power; and a resonant circuit which receives the high frequency square wave power from the inverter, adjusts impedance, transforms the high frequency square wave power into high frequency sine wave power, and outputs the high frequency sine wave power. | 04-29-2010 |
20100225240 | Multi-Stage Power Supply For a Load Control Device Having a Low-Power Mode - A multi-stage power supply for a load control device is able to operate in a low-power mode in which the power supply has a decreased power consumption when an electrical load controlled by the load control device is off. The load control device comprises a load control circuit and a controller, which operate to control the amount of power delivered to the load. The power supply comprises a first efficient power supply (e.g., a switching power supply) operable to generate a first DC supply voltage. The power supply further comprises a second inefficient power supply (e.g., a linear power supply) operable to receive the first DC supply voltage and to generate a second DC supply voltage for powering the controller. The controller controls the multi-stage power supply to the low-power mode when the electrical load is off, such that the magnitude of the first DC supply voltage decreases to a decreased magnitude and the inefficient power supply continues to generate the second DC supply voltage. | 09-09-2010 |
20100244721 | MODULAR PROGRAMMABLE LIGHTING BALLAST - A lighting ballast is programmable as to input and output parameters. Both operational characteristics and sensed data are used to control the ballast parameters. The ballast is configured to recapture as electrical energy heat produced by the lamp. The ballast is constructed in modular fashion with a power factor correction circuit module and a ballast control circuit module that snap together to achieve a large number of input voltage and lamp type variations with a small number of separate units. | 09-30-2010 |
20110012526 | POWER FACTOR CORRECTION AND DRIVER CIRCUITS - Power factor correction and driver circuits and stages are described. More particularly, power factor correction circuits are described that utilize an auxiliary inductor winding for power regulation. Driver circuits configured for electrical loads such as series arrangements of light emitting diodes are also described. An exemplary embodiment of a driver circuit can implement a comparator and/or a voltage regulator to allow for improved output current uniformity for high-voltage applications and loads, such as series configurations of LEDs. Embodiments of PFC stages and driver stages can be combined for use as a power supply, and may be configured on a common circuit board. Power factor correction and driver circuits can be combined with one or more lighting elements as a lighting apparatus. | 01-20-2011 |
20110101879 | ELECTRONIC BALLAST CIRCUIT FOR LAMPS - An electronic ballast circuit includes a power factor correction circuit, a control and amplifier circuit, a ballast controller circuit and a ballast driver circuit. The ballast driver circuit includes a resonant circuit that connects to a lamp and a strike voltage limiter circuit that regulates the behavior of the resonant circuit. An overcurrent sensor circuit may be included to indirectly the control the ballast controller circuit via the control and amplifier circuit. The strike voltage limiter circuit uses varistors to change the resonant frequency of the resonant circuit to limit the voltage to the lamp. | 05-05-2011 |
20120119669 | Trailing Edge Dimmer Compatibility With Dimmer High Resistance Prediction - In at least one embodiment, an electronic system includes a controller, and the controller provides compatibility between an electronic light source and a trailing edge dimmer. In at least one embodiment, the controller is capable of predicting an estimated occurrence of a trailing edge of a phase cut AC voltage and accelerating a transition of the phase cut AC voltage from the trailing edge to a predetermined voltage threshold. In at least one embodiment, the controller predicts an estimated occurrence of the trailing edge of the phase cut AC voltage on the basis of actual observations from one or more previous cycles of the phase cut AC voltage. | 05-17-2012 |
20120161664 | DRIVING CIRCUIT AND LIGHTING EQUIPMENT USING THE SAME - A driving circuit and lighting equipment using the same are provided. The driving circuit includes a first power receiving terminal, a second power receiving terminal and a power conversion unit. The first power receiving terminal receives an alternating current (AC) input signal. The second power receiving terminal is electrically coupled to a predetermined potential. The power conversion unit is electrically coupled to the first and second power receiving terminals for transforming the AC input signal into corresponding two AC output signals of different phases, wherein the two AC output signals are with the same current. | 06-28-2012 |
20120181946 | Lighting System With Power Factor Correction Control Data Determined From A Phase Modulated Signal - A light emitting diode (LED) lighting system includes a power factor correction (PFC) controller that determines at least one power factor correction control parameter from phase delays of a phase modulated signal. In at least one embodiment, a peak voltage of the phase modulated signal is a PFC control parameter used by the PFC controller to control power factor correction and generation of a link voltage by a PFC LED driver circuit. The phase delays are related to a peak voltage of the phase modulated signal. Thus, in at least one embodiment, detecting the phase delay in one or more cycles of the phase modulated signal allows the PFC controller to determine the peak voltage of the phase modulated signal. | 07-19-2012 |
20120229046 | Power Control System for Current Regulated Light Sources - A light emitting diode (LED) lighting system includes a PFC and output voltage controller and a LED lighting power system. The controller advantageously operates from an auxiliary voltage less than a link voltage generated by the LED lighting power system. The common reference voltage allows all the components of lighting system to work together. A power factor correction switch and an LED drive current switch are coupled to the common reference node and have control node-to-common node, absolute voltage that allows the controller to control the conductivity of the switches. The LED lighting system can utilize feed forward control to concurrently modify power demand by the LED lighting power system and power demand of one or more LEDs. The LED lighting system can utilize a common current sense device to provide a common feedback signal to the controller representing current in at least two of the LEDs. | 09-13-2012 |
20120286690 | Lighting System With Power Factor Correction Control Data Determined From A Phase Modulated Signal - A light emitting diode (LED) lighting system includes a power factor correction (PFC) controller that determines at least one power factor correction control parameter from phase delays of a phase modulated signal. In at least one embodiment, a peak voltage of the phase modulated signal is a PFC control parameter used by the PFC controller to control power factor correction and generation of a link voltage by a PFC LED driver circuit. The phase delays are related to a peak voltage of the phase modulated signal. Thus, in at least one embodiment, detecting the phase delay in one or more cycles of the phase modulated signal allows the PFC controller to determine the peak voltage of the phase modulated signal. | 11-15-2012 |
20130015779 | HIGH INTENSITY DISCHARGE BALLAST CONFIGURED TO ACCOMMODATE WIDE RANGE OF INPUT AND OUTPUT CHARACTERISTICSAANM Srimuang; PaulAACI San DiegoAAST CAAACO USAAGP Srimuang; Paul San Diego CA USAANM DeKalb; Shawn W.AACI San DiegoAAST CAAACO USAAGP DeKalb; Shawn W. San Diego CA US - A ballast includes a power supply subsystem, a power factor correction circuit, a control subsystem and a half bridge. The power supply subsystem can receive an input line voltage that is within a range of approximately 310-530 volts AC or other suitable ranges. Further, the power supply subsystem can provide a rectified DC output. The power factor correction circuit receives the rectified DC output. The power factor correction circuit can include a boost converter and a buck converter that produce a selected stable bus voltage that is less than approximately 700 volts DC. The control subsystem outputs control signals based on a digital input. The half bridge receives the bus voltage and the output control signals. Additionally, the half bridge outputs a high frequency signal to a lamp. The control subsystem can include a microcontroller and a ballast controller. Further, the ballast controller can include a software module that receives the digital input and provides first input control signals to the microcontroller. | 01-17-2013 |
20130141004 | LED DRIVER PROTECTION CIRCUIT - An illustrative LED driver circuit is based on a transition-mode power factor correction integrated circuit using flyback topology. The LED driver circuit features a universal input circuit having various fault and surge protections, output circuit open load and short circuit protection, and main transformer over temperature protection. | 06-06-2013 |
20130147387 | Systems and Methods of LED Dimmer Compatibility - Systems and methods of LED dimmer compatibility offer LED systems that fit in applications regardless of whether a dimmer is present or the type of dimmer switch that is used. These systems and methods provide high power factor without wasting energy. There are at least three types of wave forms that the LED device may see. The compatibility circuit may be integrated into the LED device such that the device may be screwed into any existing light socket. The device may be usable in a socket whether or not a dimmer is on the line. If a dimmer is present, it may be a trailing edge dimmer or leading edge dimmer. If no dimmer is present on the line, the LED illumination device receives a direct AC line input. The switching of the output transistor of the PFC stage is intelligently applied based on the type of dimmer present. | 06-13-2013 |
20130169185 | ELECTRONIC BALLAST FOR LIGHTING UNIT AND LIGHTING APPARATUS - An electronic ballast for a lighting unit may include: a Power Factor Correction (PFC) circuit, an inverter, and a control circuit for controlling startup of the inverter, wherein the control circuit is coupled between the PFC circuit and the inverter and includes: a switching device coupled in a startup loop for the inverter; a unidirectional conductive device coupled between a PFC power supply circuit for providing an operation current to a PFC controller of the PFC circuit and an input of the PFC controller, for preventing a startup current flowing through the PFC circuit from triggering the switching device; and a triggering device coupled to the switching device and a connection point between the unidirectional conductive device and the PFC power supply circuit, for controlling switch-on and -off of the switching device. | 07-04-2013 |
20130193868 | INDEPENDENTLY ADJUSTABLE CURRENT AND VOLTAGE AC-AC CONVERTER - The present disclosure is directed to an alternating current (AC) to AC converter circuit for independently adjusting a current and voltage to adjust a light output of a light operating on AC power. In one embodiment, the AC to AC converter circuit includes a microprocessor, a first switch coupled to the microprocessor, a power factor controller (PFC) module coupled to the first switch, wherein the first switch is controlled by the microprocessor in accordance with a desired power output, one or more boost switches coupled to the PFC module, wherein the one or more boost switches are controlled by the PFC module as a function of an operation of the first switch and one or more load switches coupled to the one or more boost switches, wherein the one or more load switches are controlled by the microprocessor in accordance with the desired power output. | 08-01-2013 |
20130207567 | BOOST CONVERTER ASSISTED VALLEY-FILL POWER FACTOR CORRECTION CIRCUIT - A Light Emitting Diode (LED) lighting circuit has a passive valley-fill type power factor correction (PFC) circuit. A boost converter stage is coupled to the PFC circuit. | 08-15-2013 |
20130271027 | Lighting System With Power Factor Correction Control Data Determined From A Phase Modulated Signal - A light emitting diode (LED) lighting system includes a power factor correction (PFC) controller that determines at least one power factor correction control parameter from phase delays of a phase modulated signal. In at least one embodiment, a peak voltage of the phase modulated signal is a PFC control parameter used by the PFC controller to control power factor correction and generation of a link voltage by a PFC LED driver circuit. The phase delays. are related to a peak voltage of the phase modulated signal. Thus, in at least one embodiment, detecting the phase delay in one or more cycles of the phase modulated signal allows the PFC controller to determine the peak voltage of the phase modulated signal. | 10-17-2013 |
20130300312 | CONFIGURABLE LED DRIVER/DIMMER FOR SOLID STATE LIGHTING APPLICATIONS - The disclosure is directed at a configurable light emitting diode (LED) driver/dimmer for controlling a set of light fixture loads comprising: a power circuit; a primary digital controller for controlling the power circuit; a set of output current drivers, each of the set of output current drivers connected to one of the set of light fixture loads for controlling the associated light fixture load; a secondary digital controller for controlling the set of output current drivers; wherein the secondary controller transmits LED control information to control outputs of the set of output current drivers; and wherein the secondary digital controller provides digital feedback control information to the primary digital controller. | 11-14-2013 |
20140009082 | SYSTEMS AND METHODS FOR DETERMINING A TYPE OF TRANSFORMER TO WHICH A LOAD IS COUPLED - An apparatus may include a controller to provide compatibility between a load and a secondary winding of a transformer driven at its primary winding by a dimmer, wherein the controller is configured to: determine from a transformer secondary signal whether the transformer comprises a magnetic transformer or an electronic transformer; and select a compatibility mode of operation from a plurality of modes of operation based on the determination of whether the transformer comprises a magnetic transformer or an electronic transformer. A method for providing compatibility between a load and a secondary winding of a transformer driven at its primary winding by a dimmer may include determining from a transformer secondary signal whether the transformer comprises a magnetic transformer or an electronic transformer and selecting a compatibility mode of operation from a plurality of modes of operation based on the determination of whether the transformer comprises a magnetic transformer or an electronic transformer. | 01-09-2014 |
20140042926 | Power Control System for Current Regulated Light Sources - A light emitting diode (LED) lighting system includes a PFC and output voltage controller and a LED lighting power system. The controller advantageously operates from an auxiliary voltage less than a link voltage generated by the LED lighting power system. The common reference voltage allows all the components of lighting system to work together. A power factor correction switch and an LED drive current switch are coupled to the common reference node and have control node-to-common node, absolute voltage that allows the controller to control the conductivity of the switches. The LED lighting system can utilize feed forward control to concurrently modify power demand by the LED lighting power system and power demand of one or more LEDs. The LED lighting system can utilize a common current sense device to provide a common feedback signal to the controller representing current in at least two of the LEDs. | 02-13-2014 |
20140077722 | LED Lamp System - Disclosed is an LED lamp system designed to fit into a fluorescent lamp fixture and to utilize a fluorescent lamp power supply contained in the fixture and receiving power from AC mains. The LED lamp system includes an LED driver which comprises a power factor corrected driver circuit for achieving a power factor of at least about 0.8. The LED driver further comprises a current control circuit, responsive to the presence of a three-wire magnetic ballast in the fluorescent lamp power supply, for increasing the LED operating current above the nominal rated LED operating current and to a level sufficient to achieve power factor of the LED driver of at least about 0.8. | 03-20-2014 |
20150022113 | POWER FACTOR CONTROLLER BASED SINGLE-STAGE FLYBACK DRIVER AND LIGHT-EMITTING SYSTEM - Various embodiments relate to a power factor controller based single-stage flyback driver and a light-emitting system. The driver includes a primary-side circuit, a secondary-side circuit, a power factor controller, a current feedback circuit, a voltage feedback circuit, and a feedback signal generation circuit, wherein, in the secondary-side circuit, the output voltage is divided using a first voltage division resistor and a second voltage division resistor so as to provide the sampling of the output voltage to the voltage feedback circuit, and the first voltage division resistor or the second voltage division resistor is connected in parallel with a compensation branch having a capacitive reactance. | 01-22-2015 |
20150054421 | METHOD FOR CONTROLLING A POWER FACTOR CORRECTION CIRCUIT, POWER FACTOR CORRECTION CIRCUIT AND OPERATING DEVICE FOR AN ILLUMINANT - For the purpose of power factor correction, an inductance ( | 02-26-2015 |
20160081154 | POWER FACTOR CORRECTION CONTROL CIRCUIT AND DRIVING METHOD THEREOF - A circuit for adjusting a frequency of an AC direct lighting apparatus is provided. The circuit may include a reference voltage generation unit configured to receive a dimming voltage having a first frequency and a first voltage range, and generate a reference voltage having a second voltage range, a sensing section determining unit configured to generate first and second section reference voltages based on the reference voltage, and determine a driving current sensing section using the first and second section reference voltages, and a driving signal generation unit configured to generate a switching device driving signal having a second frequency through the determined driving current sensing section. | 03-17-2016 |
20180027620 | BALLAST FOR LIGHTING MEANS | 01-25-2018 |